A player designated to prevent goals in soccer is called a goalkeeper. The goalkeeper plays a crucial role in defending the team's goal, using various techniques to block shots from opponents. They are the only players allowed to use their hands and arms to play the ball, but only within their own penalty area. Goalkeepers often require exceptional reflexes, positioning, and decision-making skills to successfully deter attacks and maintain a clean sheet, making their role pivotal in the success of the team.